Cyclohexene and hexadiene carboxyaldehydes and derivatives thereof



washed neutral with salt water and benzol. moval of the benzol the residue consisted 'of impure United St tesP-atm CYCLOHEXENE AND HEXADIENE cARBoxAt- DEHYDES AND DERIVATIVES THEREOF Robert W. Teegarden, Fair Haven, and Leonard Steinbach, New Shrewsbury, 'N.J.,: assignors to International Flavors & Fragrances, Inc., New York, N.Y., a corporation of New York s a No Drawing. Filed Jan." rs, 1960, so. No. 2,602,

.6 Claims. (Cl.;260.488)

I This inventionrelates' to substituted cyclohexene and cyclohexadiene compounds, resulting from condensation with a diene alcohol, more particularly. cyclohexeneand cyclohexadiene compounds resulting fromfcondensaticn with the diene alcohol, 2 methyl, 2-hydr'oxy, 6-methylone, octene-7 and hydrogenation and ester derivatives thereof, which are Valuable new perfume materialsl The principal objects of the invention are to provide useful compounds of the type mentioned. i The invention accordingly consists of the novel products 'the specific embodiments of which are described here- -inafter by way of example. t

I The diene alcohol, 2-methyl; 2-hydroxy, 6-methylene, octenefi, or myrcenol, is a known compound derived directly from the beta-substituted butadiene, myrcene, by

addition of the elements ofwater across its isolated double bond. In its pure state 'itihasthei following c'on- It maybe prepared, iniseverall known-'ways,.'two of whicha're'as'follows: Y. 2 l c s. l is (a) Sulfuric acid catalyzes theaddition of acetic acid to myrcene at a temperature ranging from 10 to 'to give a mixture consisting essentially ofmyrcenylfa'nd terpinyl acetates. Myiceneispreferably dissolved in a .molarexcess of acetic gacidgsuflicient for complete .mis-

cibility, and H 50 is then gradually added. The

separated by vacuum fractionation;

it (b) Myrcene (containing 70 to"75.% -the remainder inert 'terpen'es) was, hydrochlorinated at which has the formula:

l( C. with anhydrous HCl gas. The resultant. hfydro- .chloride'was hydrolyzed by refluxing with. a mixture 'of sodium acetate, calcium' carbonate, and 2,6-ditertiary butyl para cresol with added wa-ter. After-the reflux period the mass was steam distilled and the distillate was stripped of unreacted vterpene by topping under jvacuum. The residue was refluxed with potassium hythe resultant product (10 to 40%: in (b) ),.the remainder .1

consisting principally of a mixture of C alcohols, viz.

-terpineol and linalool. Myrcenol reacts readily and'selecitivel yfwith dienophiles to" yield higher boilin g adducts which can 'I be easily separated from thef l nemen C alcohols by simple fractionation. These unreacted 40 tu-re-of acetates produced -is saponified-by potassium or sodium hydroxide, and the resultant alcohol myrcenol,

alcohols are inert to the reaction with the dienophiles hereinbefore mentioned.

The products formed in accordance with our invention include 4-(4-methyl 4-hydroxy amyl)A-3 substituted cyclohexene compounds' They have the following formula: 1

cm. on,

0H, 0 C-R3Rl where R R R and R each represents a substituent selected from the group consisting of hydrogen, a lower alkyl group containing not more than 4 carbon atoms, a phenyl' group and a lower alkylated phenyl group, said 'lower'alkylrof such phenyl group having not more 2 c'arbonatdms. f

The productsalso include compounds having the following formulaij a The products also include hydrogenation and ester products of the compounds whose structural formulae are as given in the last two paragraphs. Specifically, the reaction products include: 7 (a) Thereactionproductof myrcenol and acrolein,

on. on;

which is 4-(4-methyL 4-hydro-xy amyl)'A-3-cyclohexene carboxaldehyde; (b) the reaction product of myrcenol and crotonaldehyde, which has the formula:

on; on:

which is designated at 6-methyl-4-(4-methyl, 4-hydroxy amy1),A-3-cy clohexene carboxaldehyde; (c) the reaction product of myrcenol and propargyl aldehyde, which has 7 the formula:

' ont'cnt,

. hihfi j de g te Home! cyclohexadiene'carboxaldehyde. H The compounds also include the hydrogenati p uct of 4-(4-hydroxy-4-methyl 'amyl)-A3-cyc1ohexene carboxaldebyde, having the formula:

CH: CH:

COH/O\ /H mo Bic r-ciao 2a c C H H2 H2 The reaction products also include lower alkanoic acid esters of said 4-(4-methyl-4-hydroxy-amyl) A3-substituted cyclohexene compounds. Such esters include the lower allganoic acid esters of 4-(4-methyl-4-hydroxy amyl)A-3- cyclohexene carboxaldehyde, have the formula:

CH3 CH3 H2 C 0 C R C /H H2? 11-?!) C-CHO H2O CH:

where OOCR is a lower alkanoic acid radical. The lower alkanoic acids mentioned refer to the formate, acetate, propionate and butyrate, and the iso-compounds of the last two mentioned acid radicals. The acetate (f) is designated 4-(4-methyl, 4-acetoxy amyl) A-3-cyclohexene carboxaldehyde.

In carrying out the process to produce compounds in accordance with our invention we react myrcenol as follows:

The symbols R R R and R are as hereinabove designated.

In carrying out the process for making the compounds so designated, an antipolymerization agent, such as hydroquinone, is employed. The reaction is carried out at elevated temperatures in the range of about 80 C. to 175 C. for a period of time of about 2 to 6 hours, in a sealed reactor. After the reactionha's been carried on for the period mentioned, it is allowed to cool and the contents removed and preferably subjected to vacuum fractionation. The inert isomeric C alcohols distill off first, followed by the desired reaction product. Instead of hydroquinone, other antipolymerization agents may be employed, such as hydroquinone monomethyl ether, t-butyl and di-t-b'utyl para cresols.

The processes for the production of the products designated as (a), (b) and (c) mentioned above are carried out in a similar manner. Compound (0!) is prepared by successively hydrogenating and oxidizing compound (a) as described below, and compound (2,), represents the acetate ester of compound (a). and maybe prepared as describedbelow.

The following are examples of the manner in which we now prefer to carryout the process to produce the products of our invention:

EXAMPLE 1 1,438 grams alcohol mixture (40% myrcenol content, 60% alcohols inert to the reaction hereinbelow), 432 grams acrolein, and 10 grams hydroquinone are combined in a sealed reactor and heated to 150 C. for 4 /2 hours accompanied by agitation. The reactor is allowed to cool and the contents removed and subjected to vacuum fractionation. After a forerun of unreacted inert isomeric C alcohols distills off, there are obtained 640 g. of product of B.P. mm l26-133. On redistill-ation, there was obtained 442 g. of product of B.P. 122 C., with a refractive index at 20 C. 1.4915; specific gravity at 20 0., 0.9941; optical rotation, --0.02; ultraviolet absorption maximum, 292 millimicrons. The product tests 99.7% aldehyde by oxirnation test. Yield by weight=56. 8%, based on the myrcenol used. The product is 4-(4-methyl, 4-hydroxy amyl) A3-cyclohexene carboxaldehyde. This product has a very sweet lilac-lily aromatic odor.

EXAMPLE 2 1,200 grams of alcohol mixture (testing 40% as myrcenol, 60% alcohols inert to the reaction hereinbelow), 400 grams of crotonaldehyde, and 10 grams of hydroquinone, are combined in a reactor and heated for '4 hours at 150 C., accompanied by agitation. The reactor is allowed to cool, the contents removed, and subjected to vacuum fractionation. After a forerun of unchanged inert isomeric C alcohols distills off, there is obtained a product section of 425 g., boiling in the range of 137-139", at 2.5 mm., and exhibiting an 11 of 1.4867, and a 99% aldehyde content by standard oxim-ation test. Yield by weight=60% of 6-methy1, 4-(4- methyl, 4-hydroxy amyl)-A3-cyclohexene carboxaldehyde. This product has a bland, sweet, lily-like note.

EXAMPLE 3 Preparation of 4-(4-hydroxy-4-methyl amyl)-cyclohexa ne carboxaldehyde Step 1.500 grams of 4-(4-hydroxy-4-methyl amyl)- A3-cyclohexene c-arboxaldehyde were diluted to a total volume of 1.0. liter with isopropanol and hydrogenated at 100 C., and a pressure of 2000 p.s.i. in the presence of 25 grams of Raney nickel.

The material was cooled, the catalyst recovered by filtration, and the solvent isopropanol recovered under vacuum.

The residue of 485 grams was found to be free from carbonyl and unsaturation by infrared spectra and chemical analysis. (Oximation test and bromine number.)

Step 2.A mixture of 150 grams of chromic oxide in 1500 m1. of anyhdrous pyridine. was prepared by the gradual addition of the chromic oxide over a period of one hour, at 20 to 25 (3., to the pyridine;

A solution of 108 grams of 4-(4-hydroxy-4-methyl amyl)-cyclohexyl carbinol, prepared as above, in 1500 ml. of anhydrous pyridine were added to thechromic oxide solution over a period of 15 minutes, and the mass was then permitted to stand overnight.

The reaction mass was then poured into 10 liters of water and extracted with a solution of benzene and ether. The bulked extracts were Washed with water, dried over sodium sulfate, and the solvents removed under vacuum.

The residue was then vacuum distilled to give 50 grams of a product with the following. constants: B.P. C. n 1.4820, and testing. 95% as aldehyde by oximation test. This product is 4-(4-hydroxy 4-methy1 amyl) cyclohexane carboxaldehyde. The product has a fine, sweet floral odor reminiscent of lily of'the valley. Yield equals 46.3% by weight of starting carbinol.

EXAMPLE 4 Preparation of acetate of 4-(4-methyl 4-hydr0xy amyl) A-3-cycl0hexene carboxaldehyde 1500 grams of myrcenyl acetate-terpinyl acetate mixture (approximately 75% as myrcenyl acetate) derived by the sulfuric acid catalyzed addition of acetic acid to myrcene, as described above, added to 594 grams of acrolein and 10 grams of hydroquinone were heated and agitated at 150 C. for 4 hours. After cooling, the product was distilled under vacuum of approximately 1 mm., and yielded 646 grams of an adduct, which upon redistillation, gave a product testing 96% as the acetate u 1.4743 and B.P. 129 to 133 C. at 1.33 mm., giving a yield of approximately 45%. (The product possesses a soft, floral scent. It is the acetate of 4-(4- methyl, 4-hydroxy amyl) A-3-cyclohexene carboxaldehyde.

EXAMPLE 5 In standard glass equipment with stirrer, thermometer and addition-funnel, 1460 grams of alcohol mixture (40% myrcenol content, 60% isomeric alcohols inert to .the reaction hereinbelow) were heated to 80 C. and

over a period of one hour at a temperature range between 80 and 105 C., 205 grams of propargyl aldehyde were added. The temperature of the mass was then raised to 125 C. and maintained there for one hour. The mass is allowed to cool and is subjected to vacuum fractionation. After a forerun of unreacted inert isomeric C alcohols distilled off, there was obtained 536 grams of product boiling in the range at 2 myrcenol used. The product is a mixture of isomers of 4-(4-methyl, 4-hydroxy amyl) A 3,6 cyclohexadiene carboxaldehyde. The product has a .very sweet lily of the valley aromatic odor.

This application is a continuation-in-part of our application Serial No. 733,806, filed May 8, 1958.

We claim:

1. 4-(4-methyl, 4-hydroxy amyl) A 3-cyclohexene carboxaldehyde, having the following formula:

2. 6-methyl-4-(4methyl, 4-hydroxy amyl) A 3-cyclohexene carboxaldehyde, having the formula:

C1\ir /GH: H,

C-0H o H 3. 4-(4-methyl, 4-hydroxy amyl)-cyclohexene carboxaldehyde, having the formula:

CHI CHI H: C0H/C\ /H H10 H10 ('J-CHO 0' H o Ha H1.

4. 4-(4-methyl, 4-hydroxy amyl)A 3,6-cyclohexadiene carboxaldehyde, having the formula:

H: H: 5. The lower alkanoic acid ester of 4-(4-methyl, 4-hydroxy amyl) A 3cyclohexene carboxaldehyde having the,

formula CH: CH:

VH1 H: where OOCR is a lower alkanoic acid radical.

6. The acetate of 4-(4-methyl, 4-hydroxy amyl) A 3-cyc1ohexene carboxaldehyde having the formula: 

5. THE LOWER ALKANOIC ACID ESTER OF 4-(4-METHYL, 4-HYDROXY AMYL) $ 3-CYCLOHEXENE CARBOXALDEHYDE HAVING THE FORMULA: 